Mat



FIG. 1 is an upper perspective view of a mat showing my new design.

FIG. 2 is front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is an opposite side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is an enlarged detail view of area 7 in FIG. 6.

The bottom of the mat forms no part of the claimed design. 

CLAIM The ornamental design for a mat, as shown and described. 